arangosh> db._create("users", { keyOptions: { allowUserKeys: false } });
[ArangoCollection 15445, "users" (type document, status loaded)]
arangosh> db.users.save({ name: "user 1" });
{
"_id" : "users/15449",
"_key" : "15449",
"_rev" : "_XG3zGO2--_"
}
arangosh> db.users.save({ name: "user 2", _key: "myuser" });
[ArangoError 1222: unexpected document key]
arangosh> db.users.save({ name: "user 3" });
{
"_id" : "users/15454",
"_key" : "15454",
"_rev" : "_XG3zGO2--C"
}